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Date: Wed, 06 Jan 2016 12:56 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Javier Martinez Canillas <javier@....samsung.com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
Mauro Carvalho Chehab <mchehab@....samsung.com>,
Enrico Butera <ebutera@...il.com>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
Enric Balletbo i Serra <eballetbo@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Eduard Gavin <egavinc@...il.com>,
Hans Verkuil <hans.verkuil@...co.com>,
linux-media@...r.kernel.org
Subject: Re: [PATCH 10/10] [media] tvp5150: Configure data interface via pdata or DT
Hi Javier,
Thank you for the patch.
On Monday 04 January 2016 09:25:32 Javier Martinez Canillas wrote:
> The video decoder supports either 8-bit 4:2:2 YUV with discrete syncs
> or 8-bit ITU-R BT.656 with embedded syncs output format but currently
> BT.656 it's always reported. Allow to configure the format to use via
> either platform data or a device tree definition.
>
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> ---
> drivers/media/i2c/tvp5150.c | 61 ++++++++++++++++++++++++++++++++++++++++--
> include/media/i2c/tvp5150.h | 5 ++++
> 2 files changed, 64 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/i2c/tvp5150.c b/drivers/media/i2c/tvp5150.c
> index fed89a811ab7..8bce45a6e264 100644
> --- a/drivers/media/i2c/tvp5150.c
> +++ b/drivers/media/i2c/tvp5150.c
> @@ -6,6 +6,7 @@
> */
>
> #include <linux/of_gpio.h>
> +#include <linux/of_graph.h>
> #include <linux/i2c.h>
> #include <linux/slab.h>
> #include <linux/videodev2.h>
> @@ -15,6 +16,7 @@
> #include <media/v4l2-device.h>
> #include <media/i2c/tvp5150.h>
> #include <media/v4l2-ctrls.h>
> +#include <media/v4l2-of.h>
>
> #include "tvp5150_reg.h"
>
> @@ -39,6 +41,7 @@ struct tvp5150 {
> struct media_pad pad;
> struct v4l2_ctrl_handler hdl;
> struct v4l2_rect rect;
> + struct tvp5150_platform_data *pdata;
How about embedding tvp5150_platform_data instead of pointing to it ? It would
save an allocation and you could get rid of the pdata != NULL checks.
> v4l2_std_id norm; /* Current set standard */
> u32 input;
> @@ -757,6 +760,7 @@ static int tvp5150_s_std(struct v4l2_subdev *sd,
> v4l2_std_id std) static int tvp5150_reset(struct v4l2_subdev *sd, u32 val)
> {
> struct tvp5150 *decoder = to_tvp5150(sd);
> + struct tvp5150_platform_data *pdata = decoder->pdata;
>
> /* Initializes TVP5150 to its default values */
> tvp5150_write_inittab(sd, tvp5150_init_default);
> @@ -774,6 +778,10 @@ static int tvp5150_reset(struct v4l2_subdev *sd, u32
> val) v4l2_ctrl_handler_setup(&decoder->hdl);
>
> tvp5150_set_std(sd, decoder->norm);
> +
> + if (pdata && pdata->bus_type == V4L2_MBUS_PARALLEL)
> + tvp5150_write(sd, TVP5150_DATA_RATE_SEL, 0x40);
> +
> return 0;
> };
>
> @@ -940,6 +948,16 @@ static int tvp5150_cropcap(struct v4l2_subdev *sd,
> struct v4l2_cropcap *a) static int tvp5150_g_mbus_config(struct v4l2_subdev
> *sd,
> struct v4l2_mbus_config *cfg)
> {
> + struct tvp5150_platform_data *pdata = to_tvp5150(sd)->pdata;
> +
> + if (pdata) {
> + cfg->type = pdata->bus_type;
> + cfg->flags = pdata->parallel_flags;
The clock and sync signals polarity don't seem configurable, shouldn't they
just be hardcoded as currently done ?
> + return 0;
> + }
> +
> + /* Default values if no platform data was provided */
> cfg->type = V4L2_MBUS_BT656;
> cfg->flags = V4L2_MBUS_MASTER | V4L2_MBUS_PCLK_SAMPLE_RISING
>
> | V4L2_MBUS_FIELD_EVEN_LOW | V4L2_MBUS_DATA_ACTIVE_HIGH;
>
> @@ -986,13 +1004,20 @@ static int tvp5150_enum_frame_size(struct v4l2_subdev
> *sd,
>
> static int tvp5150_s_stream(struct v4l2_subdev *sd, int enable)
> {
> + struct tvp5150_platform_data *pdata = to_tvp5150(sd)->pdata;
> + /* Output format: 8-bit ITU-R BT.656 with embedded syncs */
> + int val = 0x09;
> +
> + /* Output format: 8-bit 4:2:2 YUV with discrete sync */
> + if (pdata && pdata->bus_type == V4L2_MBUS_PARALLEL)
> + val = 0x0d;
> +
> /* Initializes TVP5150 to its default values */
> /* # set PCLK (27MHz) */
> tvp5150_write(sd, TVP5150_CONF_SHARED_PIN, 0x00);
>
> - /* Output format: 8-bit ITU-R BT.656 with embedded syncs */
> if (enable)
> - tvp5150_write(sd, TVP5150_MISC_CTL, 0x09);
> + tvp5150_write(sd, TVP5150_MISC_CTL, val);
> else
> tvp5150_write(sd, TVP5150_MISC_CTL, 0x00);
>
> @@ -1228,11 +1253,42 @@ static inline int tvp5150_init(struct i2c_client *c)
> return 0;
> }
>
> +static struct tvp5150_platform_data *tvp5150_get_pdata(struct device *dev)
> +{
> + struct tvp5150_platform_data *pdata = dev_get_platdata(dev);
> + struct v4l2_of_endpoint bus_cfg;
> + struct device_node *ep;
> +
> + if (pdata)
> + return pdata;
Nobody uses platform data today, I wonder whether we shouldn't postpone adding
support for it until we have a use case. Embedded systems (at least the ARM-
based ones) should use DT.
> + if (IS_ENABLED(CONFIG_OF) && dev->of_node) {
> + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return NULL;
> +
> + ep = of_graph_get_next_endpoint(dev->of_node, NULL);
> + if (!ep)
> + return NULL;
> +
> + v4l2_of_parse_endpoint(ep, &bus_cfg);
Shouldn't you check the return value of the function ?
> +
> + pdata->bus_type = bus_cfg.bus_type;
> + pdata->parallel_flags = bus_cfg.bus.parallel.flags;
The V4L2_MBUS_DATA_ACTIVE_HIGH flags set returned by tvp5150_g_mbus_config()
when pdata is NULL is never set by v4l2_of_parse_endpoint(), should you add it
unconditionally ?
> + of_node_put(ep);
> + return pdata;
> + }
> +
> + return NULL;
> +}
> +
> static int tvp5150_probe(struct i2c_client *c,
> const struct i2c_device_id *id)
> {
> struct tvp5150 *core;
> struct v4l2_subdev *sd;
> + struct tvp5150_platform_data *pdata = tvp5150_get_pdata(&c->dev);
> int res;
>
> /* Check if the adapter supports the needed features */
> @@ -1262,6 +1318,7 @@ static int tvp5150_probe(struct i2c_client *c,
> if (res < 0)
> return res;
>
> + core->pdata = pdata;
> core->norm = V4L2_STD_ALL; /* Default is autodetect */
> core->input = TVP5150_COMPOSITE1;
> core->enable = 1;
> diff --git a/include/media/i2c/tvp5150.h b/include/media/i2c/tvp5150.h
> index 649908a25605..e4cda0c843df 100644
> --- a/include/media/i2c/tvp5150.h
> +++ b/include/media/i2c/tvp5150.h
> @@ -30,4 +30,9 @@
> #define TVP5150_NORMAL 0
> #define TVP5150_BLACK_SCREEN 1
>
> +struct tvp5150_platform_data {
> + enum v4l2_mbus_type bus_type;
> + unsigned int parallel_flags;
> +};
> +
> #endif
--
Regards,
Laurent Pinchart
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